Gray Box operative Castle Kinkade always gets the job done, no matter how tough the assignment. But when he agrees to protect white-hat hacker Kit Westcott, Castle's loyalty is tested like never before. Trapped in the closest of quarters, protective instincts flaring, he can feel the ice surrounding his heart melt…and he knows he'd do anything to keep Kit safe. Even defy the rules that shaped his life. Castle is the last person Kit should confide in, let alone be attracted to, but he's the only ally she has left. Under threat of imminent attack—and a chilling conspiracy that hits too close to home—Castle and Kit are forced to put their hearts and lives on the line…and stop at nothing to face the greatest danger the world has ever known. Readers Love Juno Rushdan's : "Tense and fulfilling. Settle back and savor this one."—STEVE BERRY, bestselling author "Fast-paced, intense, and sexy—a must-read romantic suspense!"—CYNTHIA EDEN, and "A fast-paced, spine-tingling thriller you won't want to put down!"—LAURA GRIFFIN, "An unputdownable thrill ride."—LEXI BLAKE, "A romantic thriller that handily juggles emotional intensity and a heart-pounding, James Bond-ian adventure."—